Gigahertz Frequency Antiferromagnetic Resonance and Strong Magnon-Magnon Coupling in the Layered Crystal CrCl3

被引：134
|
作者：
MacNeill, David [1 ]
Hou, Justin T. [2 ]
Klein, Dahlia R. [1 ]
Thang, Pengxiang [2 ]
Jarillo-Herrero, Pablo [1 ]
Liu, Luqiao [2 ]
机构：
[1] MIT, Dept Phys, Cambridge, MA 02139 USA
[2] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
来源：
PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 04期
基金：
美国国家科学基金会;
关键词：
SPIN-WAVE; SUBLATTICE MAGNETIZATION; FERROMAGNETISM; BEHAVIOR; FIELD;
D O I：
10.1103/PhysRevLett.123.047204
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report broadband microwave absorption spectroscopy of the layered antiferromagnet CrCl3. We observe a rich structure of resonances arising from quasi-two-dimensional antiferromagnetic dynamics. Because of the weak interlayer magnetic coupling in this material, we are able to observe both optical and acoustic branches of antiferromagnetic resonance in the GHz frequency range and a symmetry-protected crossing between them. By breaking rotational symmetry, we further show that strong magnon-magnon coupling with large tunable gaps can be induced between the two resonant modes.
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页数：6
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